Does the prison mailbox rule apply to pleadings filed in both state and federal courts?

^1. People v. Wende, 25 Cal.3d 436 (1979) (approving of the practice whereby appointed counsel files an appellate brief setting forth a summary of the proceedings as well as the facts of the case and requests the court to independently review the record because there are no arguable legal issues to raise).

^2. Petitioner has been given the benefit of the prison mailbox rule for all of his pleadings filed in both state and federal court. See Campbell v. Henry, 614 F.3d 1056, 1059 (9th Cir. 2010) (applying the mailbox rule to both state and federal filings by incarcerated inmates).